Net Sales by Geography (Details) - USD ($) $ in Millions		12 Months Ended
		Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019
Disaggregation of Revenue [Line Items]
Net sales		$ 3,461	$ 3,363	$ 3,324
United States
Disaggregation of Revenue [Line Items]
Net sales		1,748	1,690	1,563
Developed International [Member]
Disaggregation of Revenue [Line Items]
Net sales	[1]	1,014	901	917
Emerging [Member]
Disaggregation of Revenue [Line Items]
Net sales	[2]	578	572	597
Travel Retail [Member]
Disaggregation of Revenue [Line Items]
Net sales	[3]	63	125	140
Non-branded and bulk [Member]
Disaggregation of Revenue [Line Items]
Net sales	[4]	$ 58	$ 75	$ 107

[1] Represents net sales of branded products to “advanced economies” as defined by the International Monetary Fund (IMF), excluding the United States. Our largest developed international markets are Australia, Germany, the United Kingdom, France, and Canada.

[2] Represents net sales of branded products to “emerging and developing economies” as defined by the IMF. Our largest emerging markets are Mexico, Poland, Brazil, and Russia.

[3] Represents net sales of branded products to global duty-free customers, other travel retail customers, and the U.S. military regardless of customer location.

[4] Includes net sales of used barrels, bulk whiskey and wine, and contract bottling regardless of customer location.